| Picture | Plant Name | Botanical Name | Plant Description |
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| Accolade American Elm | Ulmus x 'Morton' | Large deciduous relative of the American Elm derived from a hybrid planted at Morton Arboretum in 1924. Shows resistance to dutch elm disease. Dark green leaves are ovate with serrated edges and defined veins. Its attractive vase shape and yellow fall color make it a beautiful landscape tree. Tolerant of drought and poor soils. |
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| Adams Crabapple | Malus 'Adams' | Small deciduous flowering tree. Pink flowers bloom in April followed by small glossy-red crabapples that persist into winter. Reddish tinted leaves emerge in spring, turn green in summer and end orange-red in the fall. This variety shows good disease resistance. |
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| Agave Leaved Sea Holly | Eryngium agavifolium | Clump-forming, evergreen perennial. Bright green, lance-shaped leaves have toothed margins and resemble an agave. White, thistle-like flower heads form in summer. May not be entirely winter hardy and will struggle through Utah winters. |
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| Alaska Shasta Daisy | Leucanthemum x superbum 'Alaska' | Clump-forming perennial. Produces large, single, pure white flowers up to 3" in diameter with yellow centers in late-summer to autumn. Leaves are dark green, glossy, lance-shapeds are toothed. Plant in well-drained soils. Tolerates some drought but prefers moderate amounts of water. |
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| Alder-Leaf Mountain Mahogany | Cercocarpus montanus | A semi-evergreen shrub native to Western North America. Small yellow flowers turn to more conspicuous tufted seeds. The leaves are broader than other mountain mahogany species with crowded parallel veins. Very drought tolerant and will drop its leaves in extreme drought situations and then fully recover. Works great as a massed planting. |
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| Alder-Leaved Serviceberry | Amelanchier alnifolia | Suckering, deciduous shrub native to the western United States. Rounded, dark-green leaves are slightly toothed at the tips and turn yellow to red in the fall. Clusters of pure white flowers, up to 1" in diameter, bloom in late-spring followed by purple-black berries. Berries are said to resemble blueberries in both look and taste and are often used in jellies and jams. Tolerant of alkaline soils. |
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| Alexander's White Candytuft | Iberis sempervirens 'Alexander's White' | Low-growing, evergreen perennial that is more compact and flowers more than the species. Spreading branches may become woody overtime. Produces small pure white, four petalled flowers in dense, flattened clusters (corymbs) in April-May. Has dark green, leathery leaves 1-1.5" long. Prefers full sun and average, well drained soil. |
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| Alexandrina Magnolia | Magnolia x soulangeana 'Alexandrina' | Small deciduous flowering hybrid tree. Large fragrant flowers (3-6 in. across) appear in early spring before the leaves. Flowers are white on the inside and rosy to dark-pink on the outside. Dark green obovate leaves turn yellow in the fall. Does not tolerate soil extremes. Prefers fertile soils with moderate amounts of water. Plant in a place that will showcase the spring blooms. |
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| Alkali Sacaton | Sporobolus airoides | Clump-forming perennial grass with lightly sharp-edged, gray-green leaves 12-24" long. In mid summer, produces cloud-like flower pannicles of golden, pinkish bronze 24-36" long above the foliage. Extremely drought tolerant. |
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| Allee Chinese Elm | Ulmus parvifolia 'Emer II' | Large deciduous tree. This variety of elm is highly resistant to dutch elm disease. Dark green leaves are ovate with serrated edges and defined veins. Vase-shaped branching and attractive bark make this a beautiful tree. Requires adequate water to perform well. |
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| Allegheny Serviceberry | Amelanchier laevis | Small tree or large deciduous shrub. Usually grown with multiple stems. Pure-white flowers grow in clusters in early-spring. Finely serrated, smooth leaves are purple when new then change to mid-green and then to orange-red in the fall. Prefers moist, well-drained soils but will tolerate a wide variety of conditions. |
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| Allgold Broom | Cytisus x praecox 'Allgold' | Hybrid mounding deciduous shrub. This variety of broom is slightly taller than the species. Dark green stems appear broom-like, hence the name. Bright yellow flowers adorn this shrub throughout the spring. Adapts readily to hot and dry conditions but with shorter growth. |
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| Allwood Pink | Dianthus Allwoodii Alpinus Group | Mat-forming perennial producing single, scentless, bright rose-red to pink flowers with toothed petals and darker centers. Has a grassy blue-gray foliage. Profuse bloom time through mid-summer. Prefers full sun and somewhat dry soil. Common name refers to the toothed edges of the petals which look as though they were cut with pinking shears. |
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| Alpine Baby's Breath | Gypsophila petraea | An alpine perennial with masses of small white flowers on upright stems. Abundant dark green clumps of narrow foliage are a nice addition to any rock garden. Availability of this variety is not as great as other species. Needs excellent drainage and consistent watering. |
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| Alpine Skullcap | Scutellaria alpina | Low-growing, spreading perennial with gray-green, toothed-leaves. Blooms during mid-summer with lavender and white flowers. Does best in full sun or partial shade with some additional watering. Great addition for rock gardens and to attract pollinators. Seed pods provide interest during late-summer and fall. |
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| American Cranberrybush | Viburnum opulus var. americanum | Not actually related to the cranberry, this mounding deciduous shrub does produce edible, is somewhat bitter, berries. Lobed leaves resemble those of the maple and may turn purplish in the fall. Clusters of pure white flowers in the spring give way to bright red berries that have been used in jams and jellies. This shrub is native to swamps and bogs, and although it is tolerant of many soil types, needs consistent water. |
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| American Linden | Tilia americana | Large deciduous tree with a pyramidal form when young, becoming more upright with age. Large, dark-green, heart-shaped leaves may scorch in extremely dry years without permanently damaging the tree. Requires some pruning to maintain an acceptable branching structure. June brings abundant small, white, extremely fragrant blossoms. Plant in areas with room to spread. Tolerates occasional drought and slightly alkaline soils. |
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| American Mountain Mint | Pycnanthemum muticum | Native to North America. A fragrant relative of the common mint. Has many uses including medicinal. As with many mints, it is used in teas and herbal treatments. Pinkish flowers with whitish bracts are pleasant rather than showy. |
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| American Smoketree | Cotinus obovatus | Small deciduous tree native to North America. It is often treated more like a large shrub. Leaves emerge as pinkish-bronze turning blue-green in the summer and ending with spectacular shades of yellow, red, orange and purple in the fall. Airy panicles of flowers appear in spring and give rise to the smoke in the common name. Tolerant of drought, compacted soils and alkaline soils. |
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| Amur Cork Tree | Phellodendron amurense | Medium growing, spreading deciduous tree that grows significantly wider than tall. Grows on a short trunk with thick, brownish-grey bark. Dark green leaves are compound and have a leathery feel. Insignificant yellowish-green flowers bloom in the spring and produce clumps of many dark fruits loved by birds. Has been shown to be invasive in certain parts of the United States. Plant fruitless varieties when possible. |
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